A) Positive
B) Negative
C) Zero
D) None of these
Correct Answer: C
Solution :
\[(a+b)\,.\,(a-b)=a.a+b.a-b.a-b.b\] \[=a.a-b.b=\,|a{{|}^{2}}-|b{{|}^{2}}\] \[=0\], \[(\because \,|\mathbf{a}|\,=\,|\mathbf{b}|)\].You need to login to perform this action.
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